Radioactivity

Radioactive decay

________ is the process by which an unstable atomic nucleus loses energy by radiation.

Beta decay

________ occurs when in a nucleus with too many protons or neutrons, one of the protons or neutrons gets transformed into the other.

alpha particle

When a(n) ________ is emitted from a nucleus the nucleus loses two protons and two neutron.

Becquerel

________- Unit of activity which is 1 decay per sec.

Geiger Muller

The instrument used to detect the effects of radiation is called the ________ tube (can detect and measure radiation)

Neutrons

________ have a charge of 0 and a mass of 1.

Protons

________ have a charge of +1 and a mass of 1.

Ionisation

________- Atoms that have become charged by their electrons being knocked of by radiation.

Gamma radiation

________ is part of the EM spectrum; a wave with a very high frequency and a very short wavelength.

Gamma rays

________ are used to sterilise syringes because ________ are penetrating but as well as this ________ kill viruses and bacteria.

alpha source

It is more dangerous to eat food contaminated with a(n) ________ as it is more ionising.

Geiger Muller Tube

Count rate is the number of decays actually recorded per second by detector (ex: ________)

Peer review

________- data published and checked by other scientists.

Beta radiation

________ is a fast moving high energy electron, and is called a beta particle.

high speed

It is the nucleus of a helium particle and travels at a very ________.

Half life

________- How long it takes for half the nuclei to decay.

atom

A(n) ________ decays into a new atom by changing a neutron into a proton and an electron.

atom

A(n) ________ decays into a new atom by and emits alpha particle.

Half life

________- the time it takes for half the nuclei to decay.

Gamma radiation

________ is a high energy electromagnetic radiation with an electric charge of 0 and a relative atomic mass of 0.

There are three main types of radiation

Gamma, Beta and Alpha

Radioactive decay

becoming stable

Count rate is the number of decays actually recorded per second by detector (ex

Geiger-Muller Tube)

Half-life

the time it takes for half the nuclei to decay

Irradiated

when an object has been exposed to ionising radiation

Ionisation

Atoms that have become charged by their electrons being knocked of by radiation

Peer review

data published and checked by other scientists

Count rate

the number of counts per second on a geiger counter

Half-life

How long it takes for half the nuclei to decay

Becquerel

Unit of activity which is 1 decay per sec